PlainWater
States → New Hampshire

Community Water System · PWS NH1481010

Marlborough Water Works

Marlborough, New Hampshire 03455 - drinking water served from groundwater sources to 750 people, tracked in EPA SDWIS and UCMR5.

750
People served
245
EPA violations
18
Health-based
Untested
UCMR5 result

The verdict

EPA records 245 drinking-water violations at Marlborough Water Works, 7% of them health-based - above the New Hampshire per-system average.

245
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
750
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Marlborough Water Works

Marlborough Water Works is a local-owned community water system that delivers drinking water to 750 residents in Marlborough, New Hampshire (Cheshire County) through 300 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 245 total violations for this system , of which 18 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 223 monitoring and reporting violations are on file. The most recent violation on record dates to 2010.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across New Hampshire, EPA tracks 2,453 public water systems serving 1,242,123 people, with 155,970 cumulative violations and 29,649 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 63.6 violations. Statewide, 23 of 51 UCMR5-tested systems have reported PFAS detections (45.1%).

Marlborough Water Works's 245 violations sit above the New Hampshire average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
750
Total Violations
245
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
300
County
Cheshire
School/Daycare
No
MCL Violations
18
Monitoring Violations
223
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 18 2010
Coliform (TCR) MR 13 1993
1,2,4-Trichlorobenzene MR 10 1995
cis-1,2-Dichloroethylene MR 10 1995
Xylenes, Total MR 10 1995
DICHLOROMETHANE MR 10 1995
o-Dichlorobenzene MR 10 1995
Vinyl chloride MR 10 1995
1,1-Dichloroethylene MR 10 1995
trans-1,2-Dichloroethylene MR 10 1995
1,2-Dichloroethane MR 10 1995
1,1,1-Trichloroethane MR 10 1995
Carbon tetrachloride MR 10 1995
1,2-Dichloropropane MR 10 1995
1,1,2-Trichloroethane MR 10 1995
Tetrachloroethylene MR 10 1995
CHLOROBENZENE MR 10 1995
Benzene MR 10 1995
Toluene MR 10 1995
Ethylbenzene MR 10 1995
Styrene MR 10 1995
p-Dichlorobenzene MR 10 1995
Trichloroethylene MR 10 1995
Consumer Confidence Rule Other 2 2010

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Marlborough Water Works.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NH1481010 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New Hampshire Drinking Water Authority

New Hampshire's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NH regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2010 Coliform (TCR) MCL 18 SDWIS / NH1481010 / 3100
2010 Consumer Confidence Rule Other 2 SDWIS / NH1481010 / 7000
1995 1,2,4-Trichlorobenzene MR 10 SDWIS / NH1481010 / 2378
1995 cis-1,2-Dichloroethylene MR 10 SDWIS / NH1481010 / 2380
1995 Xylenes, Total MR 10 SDWIS / NH1481010 / 2955
1995 DICHLOROMETHANE MR 10 SDWIS / NH1481010 / 2964
1995 o-Dichlorobenzene MR 10 SDWIS / NH1481010 / 2968
1995 Vinyl chloride MR 10 SDWIS / NH1481010 / 2976
1995 1,1-Dichloroethylene MR 10 SDWIS / NH1481010 / 2977
1995 trans-1,2-Dichloroethylene MR 10 SDWIS / NH1481010 / 2979
1995 1,2-Dichloroethane MR 10 SDWIS / NH1481010 / 2980
1995 1,1,1-Trichloroethane MR 10 SDWIS / NH1481010 / 2981
1995 Carbon tetrachloride MR 10 SDWIS / NH1481010 / 2982
1995 1,2-Dichloropropane MR 10 SDWIS / NH1481010 / 2983
1995 1,1,2-Trichloroethane MR 10 SDWIS / NH1481010 / 2985

How Marlborough Water Works Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Marlborough Water Works New Hampshire avg Federal benchmark
Total violations 245 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 18 12.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 45.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 750 506 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,453 regulated public water systems in New Hampshire.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Marlborough Water Works water safe to drink? ▼
Marlborough Water Works (PWS ID: NH1481010) has 245 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 750 people using Groundwater sources.
How many people does Marlborough Water Works serve? ▼
Marlborough Water Works serves 750 people in Marlborough, New Hampshire. It is a Local-owned system using Groundwater water sources with 300 service connections.
What type of violations does Marlborough Water Works have? ▼
Marlborough Water Works has 245 total violations: 18 health-based violations (MCL exceedances or treatment failures), 223 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Marlborough Water Works water? ▼
No PFAS testing data is available for Marlborough Water Works under the EPA's UCMR5 monitoring program.
What water source does Marlborough Water Works use? ▼
Marlborough Water Works uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.